botched

(verb) make a mess of, destroy or ruin. Synonyms: botch, bodge, bumble, fumble, botch up, muff, blow, flub, screw up, ball up, spoil, muck up, bungle, fluff, bollix, bollix up, bollocks, bollocks up, bobble, mishandle, louse up, foul up, mess up, fuck up. Examples: "I botched the dinner and we had to eat out." "The pianist screwed up the difficult passage in the second movement."

(adj) spoiled through incompetence or clumsiness. Synonyms: bungled. Examples: "A bungled job."